This situation, as you've outlined it in a bare bones manner, is simply one of those unfortunate, sad and pathetic situations that nobody wants to see occur ...
You shouldn't shoot what you can't see .... and you shouldn't shoot just because you're startled awake in "unusual" circumstances ... being in hostile jungle environments notwithstanding ...
A hysterical family member running into the sleeping person's room to get help for some emergency reason, carrying some unexpected "tool" or article in their hands, isn't that far fetched for most large family homes ...
Too many family members have been shot and killed by other family members who thought they were someone else who represented a "threat", and didn't see who they were shooting at ...
"Bare fear alone" is insufficient to justify using deadly force. Other factors must be present.
Like the man said, Stupidity should be painful ...
But, since you shared, I'll share one that's always made me feel somewhat embarrassed, and ends on a lighter note ...
Somewhere between 28-30 years ago, I was a young man visiting my out-of-town girlfriend (now wife) and her family for the weekend. I was sleeping in the back bedroom at the opposite end of the ranch-style house from everyone else ... of course
...
I should explain that once I became of age, my dad had encouraged me to sleep safely with my .45, even at home, but especially while traveling ... My girlfriend didn't like guns, and her family didn't own any, but ... like me, accept my guns ...
So, one morning, while I was sleeping very soundly and peacefully ... and quite safely, I might add ...
In through the closed bedroom door burst my girlfriend and her mother, without any damned warning, shouting "They're landing in the back, in the corn bed! They're landing in the back! ..." and frantically pointing to the bedroom window which was closed, with the curtains drawn shut, but which faced the rear orchard.
They're ?? landing ?? in the back ???
While I was bouncing up front a sound sleep ... I was much younger ... trying to make sense of what they were shouting, and the direction they were both pointing outside the window ... I heard the strangest loud, undulating humming and whooshing noise I'd ever heard.
My cocked & locked Commander was in my hand before my feet hit the floor, and I was fuzzily trying to imagine what & who the hell would be landing in back of the house, making that god-awful weird noise, which I just then was able to orient on ... and I realized it was traveling overhead and moving slowly away from the house, and lower ... toward the orchard where the women were still frantically pointing ... and it sounded uncomfortably too close, like right outside.
Wearing my underwear and my Commander, I threw open the curtains ... expecting ... what, I had no idea ...
But it damn sure wasn't a crippled hot air balloon ... being followed on foot by a fair crowd of folks that had been following it to its unexpected emergency landing point ... merrily trampling the rows of corn in which the gondola had safely landed.
Everybody was having such a damned fine time with all the excitement, I doubt they noticed the almost naked young man holding the .45 pistol at his side, looking out the window at the melee ... perplexed, and somewhat annoyed now that I was awake (I'm NOT a morning person under the best of circumstances) ... and also wondering what the hell my girlfriend and her mother found so entertaining suddenly ...
Well, it was time to get up anyway, and it sure seemed like it wasn't going to get any quieter any time soon ...